"""
部署引擎服务
"""
import asyncio
import logging
from typing import Dict, Any, Optional
from datetime import datetime

import docker
from kubernetes import client, config
from kubernetes.client.rest import ApiException

from app.core.config import settings
from app.models.deployment import Deployment
from app.models.application import Application
from app.models.environment import Environment

logger = logging.getLogger(__name__)


class DeployEngine:
    """部署引擎基类"""
    
    def __init__(self):
        self.docker_client = None
        self.k8s_client = None
        self._init_clients()
    
    def _init_clients(self):
        """初始化客户端"""
        try:
            # 初始化Docker客户端
            self.docker_client = docker.from_env()
            
            # 初始化Kubernetes客户端
            if settings.K8S_CONFIG_PATH:
                config.load_kube_config(config_file=settings.K8S_CONFIG_PATH)
            else:
                config.load_incluster_config()
            
            self.k8s_client = client.CoreV1Api()
        except Exception as e:
            logger.error(f"初始化客户端失败: {e}")
    
    async def deploy(self, deployment: Deployment, application: Application, environment: Environment) -> Dict[str, Any]:
        """执行部署"""
        try:
            if application.app_type == "docker":
                return await self._deploy_docker(deployment, application, environment)
            elif application.app_type == "k8s":
                return await self._deploy_kubernetes(deployment, application, environment)
            elif application.app_type == "static":
                return await self._deploy_static(deployment, application, environment)
            else:
                raise ValueError(f"不支持的应用类型: {application.app_type}")
        except Exception as e:
            logger.error(f"部署失败: {e}")
            raise
    
    async def _deploy_docker(self, deployment: Deployment, application: Application, environment: Environment) -> Dict[str, Any]:
        """Docker部署"""
        try:
            # 构建镜像
            image_name = f"{settings.DOCKER_REGISTRY}/{settings.DOCKER_NAMESPACE}/{application.name}:{deployment.version}"
            
            # 拉取或构建镜像
            if application.repository_url:
                # 从仓库拉取
                image = self.docker_client.images.pull(image_name)
            else:
                # 本地构建
                image = self.docker_client.images.build(
                    path=application.repository_url or ".",
                    tag=image_name,
                    dockerfile=application.dockerfile_path
                )[0]
            
            # 停止旧容器
            try:
                old_container = self.docker_client.containers.get(f"{application.name}-{environment.name}")
                old_container.stop()
                old_container.remove()
            except docker.errors.NotFound:
                pass
            
            # 创建新容器
            container = self.docker_client.containers.run(
                image_name,
                name=f"{application.name}-{environment.name}",
                ports=application.ports or {},
                environment=application.environment_variables or {},
                volumes=application.volumes or {},
                networks=application.networks or [],
                detach=True,
                restart_policy={"Name": "always"}
            )
            
            return {
                "status": "success",
                "container_id": container.id,
                "image": image_name,
                "message": "Docker部署成功"
            }
            
        except Exception as e:
            logger.error(f"Docker部署失败: {e}")
            return {
                "status": "failed",
                "error": str(e),
                "message": "Docker部署失败"
            }
    
    async def _deploy_kubernetes(self, deployment: Deployment, application: Application, environment: Environment) -> Dict[str, Any]:
        """Kubernetes部署"""
        try:
            # 创建Deployment配置
            deployment_config = {
                "apiVersion": "apps/v1",
                "kind": "Deployment",
                "metadata": {
                    "name": f"{application.name}-{deployment.version}",
                    "namespace": environment.k8s_config.get("namespace", settings.K8S_NAMESPACE)
                },
                "spec": {
                    "replicas": deployment.strategy.get("replicas", 1),
                    "selector": {
                        "matchLabels": {
                            "app": application.name,
                            "version": deployment.version
                        }
                    },
                    "template": {
                        "metadata": {
                            "labels": {
                                "app": application.name,
                                "version": deployment.version
                            }
                        },
                        "spec": {
                            "containers": [{
                                "name": application.name,
                                "image": f"{settings.DOCKER_REGISTRY}/{settings.DOCKER_NAMESPACE}/{application.name}:{deployment.version}",
                                "ports": [{"containerPort": port["container"]} for port in application.ports or []],
                                "env": [{"name": k, "value": v} for k, v in (application.environment_variables or {}).items()],
                                "resources": application.resource_limits or {}
                            }]
                        }
                    }
                }
            }
            
            # 应用Deployment
            k8s_apps_v1 = client.AppsV1Api()
            result = k8s_apps_v1.create_namespaced_deployment(
                namespace=environment.k8s_config.get("namespace", settings.K8S_NAMESPACE),
                body=deployment_config
            )
            
            return {
                "status": "success",
                "deployment_name": result.metadata.name,
                "namespace": result.metadata.namespace,
                "message": "Kubernetes部署成功"
            }
            
        except ApiException as e:
            logger.error(f"Kubernetes部署失败: {e}")
            return {
                "status": "failed",
                "error": str(e),
                "message": "Kubernetes部署失败"
            }
    
    async def _deploy_static(self, deployment: Deployment, application: Application, environment: Environment) -> Dict[str, Any]:
        """静态文件部署"""
        try:
            # TODO: 实现静态文件部署逻辑
            # 例如：上传到CDN、同步到服务器等
            
            return {
                "status": "success",
                "message": "静态文件部署成功"
            }
            
        except Exception as e:
            logger.error(f"静态文件部署失败: {e}")
            return {
                "status": "failed",
                "error": str(e),
                "message": "静态文件部署失败"
            }
    
    async def rollback(self, deployment: Deployment, target_version: str) -> Dict[str, Any]:
        """回滚部署"""
        try:
            # TODO: 实现回滚逻辑
            return {
                "status": "success",
                "message": f"回滚到版本 {target_version} 成功"
            }
        except Exception as e:
            logger.error(f"回滚失败: {e}")
            return {
                "status": "failed",
                "error": str(e),
                "message": "回滚失败"
            }
    
    async def health_check(self, deployment: Deployment) -> Dict[str, Any]:
        """健康检查"""
        try:
            # TODO: 实现健康检查逻辑
            return {
                "status": "healthy",
                "message": "应用运行正常"
            }
        except Exception as e:
            logger.error(f"健康检查失败: {e}")
            return {
                "status": "unhealthy",
                "error": str(e),
                "message": "应用运行异常"
            }


# 创建全局部署引擎实例
deploy_engine = DeployEngine()
